Look.
Janitor is limited. 1x
Roleblock is limited. 2x
Vengeful is limited. 1x
Day Janitor is crap as Janitor's only real use is to allow scum to claim a PR that the rest of the game is oblivious to. Usually for this case, it is placed with a Role Cop combination. Firstly, I think we all agree that we aren't giving them Role Cop no matter what we choose. Secondly, Day Janitoring doesn't allow them the benefit of secretly taking on the role of a PR. Since a PR is going to claim before they are lynched, the cat is out of the bag, and if mafia tries to Jan, take on the role, and CC later, then we got obvscum. This could be used for mafia if they CC earlier, but that also is in our favor as it shrinks things down to 2. It's just over all a really useless role for mafia to have this game.
Roleblock will probably not be used D1 or until there is a claim. Mafia has to risk wasting their limited resource otherwise. Because of this we will have free range on at least one of N1-N3. And even if Mafia manages to hit a PR, we still have two others.
Venegeful is WORSE than ROLEBLOCK x 500. A kill completely eliminates a PR. A limited RB can only temporarily disable them, and we have a higher chance of getting information before or after so.